Bug 61769

Summary: "xset dpms force off" -> Crash
Product: DRI Reporter: Andreas Kloeckner <inform>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED INVALID QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
System data from Debian 'reportbug' tool. none

Description Andreas Kloeckner 2013-03-04 00:04:49 UTC 
Created attachment 75873 [details]
System data from Debian 'reportbug' tool.

On my Thinkpad X220, running the Intel driver v2.20.14 with kernel 3.8 causes "xset dpms force off" to lead to a hard crash of the machine. No SSH, no Alt+SysRq.

More system details in attached bug template. Downgrading to kernel 3.2 fixes this, but leads to other annoyances.

Related: http://www.gossamer-threads.com/lists/gentoo/user/258587
Comment 1 Andreas Kloeckner 2013-03-04 00:14:09 UTC 
Introduced a major contributing factor: "i915.i915_enable_fbc=1" on the kernel command line. Crash appears to happen with this, fine without.

Should've mentioned: Sandy bridge i7-2620M (Gen6?)

SNA: on/off doesn't seem to matter.
Comment 2 Jani Nikula 2013-03-04 08:01:44 UTC 
(In reply to comment #1)
> Introduced a major contributing factor: "i915.i915_enable_fbc=1" on the
> kernel command line. Crash appears to happen with this, fine without.

FBC is disabled by default on gen6 (and earlier) for a reason. Please don't enable it and expect everything to work. Closing as invalid, please reopen if you keep having trouble without the i915.i915_enable_fbc module parameter.

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